sascha@422: package de.intevation.gnv.jfreechart;
sascha@422:
sascha@422: import java.io.Serializable;
sascha@422:
sascha@422: /**
ingo@795: * This class is used to represent geometries (e.g. point, line, polygon). Each
ingo@795: * geometry is made up of multiple xy points stored in a single array. A line
ingo@795: * composed by start- and endpoint is stored in the following order in that
ingo@795: * array: [x1, y1, x2, y2].
ingo@795: *
sascha@780: * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
sascha@780: * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
sascha@422: */
sascha@422: public class CompactXYItems
sascha@422: implements Serializable
sascha@422: {
ingo@795: /**
ingo@795: * Array storing the xy items.
ingo@795: */
sascha@422: protected double [] data;
sascha@422:
ingo@795: /**
ingo@795: * Constructs a new CompactXYItems object with the given data.
ingo@795: *
ingo@795: * @param data An array with xy values.
ingo@795: */
sascha@422: public CompactXYItems(double [] data) {
sascha@422: this.data = data;
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: * Retrieves the x coordinate of the point with the given index.
ingo@795: *
ingo@795: * @param index Index
ingo@795: * @return X coordinate.
ingo@795: */
sascha@422: public double getX(int index) {
sascha@422: return data[index << 1];
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: * Retrieves the y coordinate of the point with the given index.
ingo@795: *
ingo@795: * @param index Index
ingo@795: * @return Y coordinate.
ingo@795: */
sascha@422: public double getY(int index) {
sascha@422: return data[(index << 1)+1];
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: * Write the tupel of xy-values at a specific index into the given array.
ingo@795: *
ingo@795: * @param index Index used to specify the xy-value.
ingo@795: * @param xy the xy coordinate is written into this array with the following
ingo@795: * order: [x,y]
ingo@795: */
sascha@422: public void get(int index, double [] xy) {
sascha@422: xy[0] = data[index = (index << 1) + 1];
sascha@422: xy[1] = data[index + 1];
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the data array.
ingo@795: */
sascha@422: public double [] getData() {
sascha@422: return data;
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @param data
ingo@795: */
sascha@422: public void setData(double [] data) {
sascha@422: this.data = data;
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: *
ingo@815: * @return the number of data points.
ingo@795: */
sascha@422: public int size() {
sascha@422: return data.length >> 1;
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: * Retrieves the bounding box spaned by the coordinates in the data array.
ingo@795: *
ingo@795: * @param bbox
ingo@815: * @return the calculated bounding box.
ingo@795: */
sascha@422: public double [] calculateBoundingBox(double [] bbox) {
sascha@422: for (int i = 0; i < data.length;) {
sascha@422: double x = data[i++];
sascha@422: double y = data[i++];
sascha@422: if (x < bbox[0]) bbox[0] = x;
sascha@422: if (y < bbox[1]) bbox[1] = y;
sascha@422: if (x > bbox[2]) bbox[2] = x;
sascha@422: if (y > bbox[3]) bbox[3] = y;
sascha@422: }
sascha@422: return bbox;
sascha@422: }
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the coordinates as string.
ingo@795: */
ingo@795: @Override
sascha@422: public String toString() {
sascha@422: StringBuilder sb = new StringBuilder();
sascha@422: for (int i = 0; i < data.length;) {
sascha@422: if (i > 0) sb.append("; ");
sascha@422: sb.append('(');
sascha@422: sb.append(data[i++]);
sascha@422: sb.append(", ");
sascha@422: sb.append(data[i++]);
sascha@422: sb.append(')');
sascha@422: }
sascha@422: return sb.toString();
sascha@422: }
sascha@422:
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the lowest x value.
ingo@795: */
sascha@422: public double getMinX() {
sascha@422: double lower = Double.POSITIVE_INFINITY;
sascha@422:
sascha@422: for (int i = 0; i < data.length; i += 2) {
sascha@422: double x = data[i];
sascha@422:
sascha@422: if (!Double.isNaN(x)) {
sascha@422: lower = Math.min(lower, x);
sascha@422: }
sascha@422: }
sascha@422:
sascha@422: return lower;
sascha@422: }
sascha@422:
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the highest x value.
ingo@795: */
sascha@422: public double getMaxX() {
sascha@422: double upper = Double.NEGATIVE_INFINITY;
sascha@422:
sascha@422: for (int i = 0; i < data.length; i += 2) {
sascha@422: double x = data[i];
sascha@422:
sascha@422: if (!Double.isNaN(x)) {
sascha@422: upper = Math.max(upper, x);
sascha@422: }
sascha@422: }
sascha@422:
sascha@422: return upper;
sascha@422: }
sascha@422:
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the lowest y value.
ingo@795: */
sascha@422: public double getMinY() {
sascha@422: double lower = Double.POSITIVE_INFINITY;
sascha@422:
sascha@422: for (int i = 1; i < data.length; i += 2) {
sascha@422: double y = data[i];
sascha@422:
sascha@422: if (!Double.isNaN(y)) {
sascha@422: lower = Math.min(lower, y);
sascha@422: }
sascha@422: }
sascha@422:
sascha@422: return lower;
sascha@422: }
sascha@422:
sascha@422:
ingo@795: /**
ingo@795: *
ingo@795: * @return the highest y value.
ingo@795: */
sascha@422: public double getMaxY() {
sascha@422: double upper = Double.NEGATIVE_INFINITY;
sascha@422:
sascha@422: for (int i = 1; i < data.length; i += 2) {
sascha@422: double y = data[i];
sascha@422:
sascha@422: if (!Double.isNaN(y)) {
sascha@422: upper = Math.max(upper, y);
sascha@422: }
sascha@422: }
sascha@422:
sascha@422: return upper;
sascha@422: }
sascha@422: }
sascha@836: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :